74 power wagon dream truck...

Totally baffled here... I'm nervous about having them whack an inch off that rear drive line... The rear shackles are swung forward a couple inches it seems like because the truck is completely unloaded.... But when it's unloaded it shouldn't be banging and you'd think the more it was loaded it's going to get even shorter... Baffled just don't know what's going on here...